<template>
    <div class="nav-bar" :class="{'is_fixed':isFixed}">
        <div class="container">
            <div class="pro-title">
                指弹吉他精品课程
            </div>
            <div class="pro-param">
                <slot name="buy"></slot>
            </div>
        </div>
    </div>
</template>
<script>
export default {
    name:'nav-bar',
    props:{
        title:String
    },
    data(){
        return {
            isFixed:false
        }
    },
    mounted(){
        window.addEventListener('scroll',this.initHeight)
    },
    methods:{
        initHeight(){
            let scrollTop = window.pageYOffset || document.documentElement.scrollTop || document.body.scrollTop;
            this.isFixed = scrollTop > 152? true:false;
        }
    },
    destroyed(){
        window.removeEventListener('scroll',this.initHeight,false)
    }
}
</script>
<style lang="scss">
    @import './../assets/scss/config.scss';
    @import './../assets/scss/mixin.scss';
    .nav-bar{
        height:70px;
        line-height:70px;
        border-top:1px solid $colorH;
        background-color:$colorG;
        z-index:10;
        &.is_fixed{
            position:fixed;
            top:0;
            left: 180px;
            box-shadow: 0 5px 5px $colorE;
        }
        .container{
            @include flex();
            .pro-title{
                font-size:$fontH;
                color:$colorB;
                font-weight:bold;
            }
            .pro-param{
                font-size:$fontJ;
                span{
                    margin:0 10px;
                }
                a{
                    color:$colorC;
                    margin: 0 10px;
                    color: white;
                }
            }
        }
    }
</style>